<template>
  <section class="todoapp">
    <!-- 除了驼峰, 还可以使用-转换链接 -->
    <TodoHeader :list="showlist" @add="addFn"></TodoHeader>
    <TodoMain :list="showlist" @sub="subFn"></TodoMain>
    <TodoFooter :len="showlist.length" @xiugai="xiugaiFn" :yangshi="getSel" @shanchu="shanchuFn"></TodoFooter>
  </section>
</template>

<script>
// 1.0 样式引入
import "./styles/base.css"
import "./styles/index.css"

import TodoHeader from "./components/TodoHeader";
import TodoMain from "./components/TodoMain";
import TodoFooter from "./components/TodoFooter";


export default {
  components: {
    TodoHeader,
    TodoMain,
    TodoFooter,
  },
  data() {
    return {
      list: [
        { id: 100, name: "吃饭", isDone: true },
        { id: 101, name: "睡觉", isDone: false },
        { id: 102, name: "打豆豆", isDone: true },
      ],
      getSel: 'all'
    };
  },

  computed: {
    showlist() {
      if (this.getSel === 'yes') {
        return this.list.filter(item => item.isDone)
      } else if (this.getSel === 'no') {
        return this.list.filter(item => !item.isDone)
      } else {
        return this.list
      }
    }
  },


  methods: {
    //删除
    subFn(id) {
      this.list = this.list.filter(item => item.id !== id)
    },
    //添加
    addFn(name) {
      this.list.push({
        id: this.list.length ? this.list.at(-1).id + 1 : 100,
        name: name,
        isDone: true,
      })
    },
    //修改页面
    xiugaiFn(getSel) {
      this.getSel = getSel
    },
    shanchuFn() {
      this.list = this.list.filter(item => !item.isDone)
    }
  },


};
</script>